From the price perspective, most private car owners chose to install the price of a few hundred dollars of low-end anti-theft products, which from one aspect reflects the current market car alarm "Civilian tendencies", because this type of anti-theft device is not high tech, always easy to stolen cars were easily succeed. The highest-tech network security products (eg: GPS) is expensive and because Shaorenwenjin. Several popular way a wide variety of anti-theft car alarm can be simply grouped into three categories, namely: mechanical anti-theft devices, electronic security and network security, from car theft to break the difficulty, the more the three types of anti-theft devices future scientific and technological content is higher, but the price is substantially proportional to the scientific and technological content.

Mechanical anti-theft device on the market is the easiest and most inexpensive an anti-theft device, the principle is very simple, that is to lock the steering wheel, pedals, or control block handle. The advantage is cheap, easy to install, a few hundred dollars or even tens of dollars can get. The disadvantage is that security is not complete, each disassembly is too much trouble, we had to find a place to place when not in use. Such locks are divided into the following categories: (1) the steering wheel lock, which locks crutches. In general, the lock within 5-10 seconds can be opened by the thief, such as using shears or a laser gun is less than a second was opened. For this flaw to launch on the market to support the market a type steering wheel lock to cover the way to make high-strength nickel-aluminum alloy steel spans a two-spoke steering wheel, followed by a steel rod in the head lock, to prevent car theft criminals use violence. This lock is hidden, there is a layer of anti-saw anti-drill steel plate protection, lock solid material than the traditional crutches, cylinder also designed to be more sophisticated, and therefore more reliable. (2) removable steering wheel, which includes a base set of features, removable steering wheel, patented lock cap. Remove the steering wheel when the first operation, the locking cap set in the steering shaft. The advantage of this anti-theft lock will not destroy the original structure, low failure rate, easy to operate. The disadvantage is that the owners have to find a space for hiding the steering wheel removed. (3) Gear Locks, one of the anti-theft device owners appreciate most. This anti-theft device and simple and sturdy, made with a special high hardness alloy steel, tamper, anti-drilling, anti-sawing, using the same materials and unique nickel silver alloy cylinder and key, with no original key is extremely difficult to open; If the key is lost, it can be used to copy the original PC card key.

Electronic anti-theft electronic anti-theft device is coupled to the electronic identification code lock, unlock, or keys are required to enter with a dozen passwords. Common are plug-piece, push-button and the remote control type three electronic anti-theft devices on the market. The biggest selling point is that the password to unlock the electronic anti-theft alarm and voice, which, depending on the transmission mode password lock code is divided into fixed formula and hopping code two. There is a remote electronic anti-theft devices on the market today, when the car theft into a car, in the car one kilometer away from the owner of the remote control will sound the alarm. The main functions of the electronic anti-theft device has the following four: First, the alarm function, when the owners remote control to lock the door, the alarm enters the state of alert at this time if a person with a key to pry the door or the car door, burglar alarm will immediately tweet, scared resistance thief. But too many false positives in life, often staged a "crying wolf" farce, but also easily lead to resentment residents. Second, the door is not closed security prompts, driving the front door is not closed properly, the warning light will flash for a few seconds in a row. Remote lock the door after the car is turned off, if the door is not closed properly, the lights will be flashing, a speaker beep until the door is closed so far. Third, look for car features, namely the owner to find the car with a remote control, the speaker will beep intermittently, accompanied by flashing lights prompt. Fourth, remote central locking, when the remote control signal transmitted correctly, the central locking is automatically turned on or off.

Network anti-theft device that is the use of modern electronic information technology, space technology and network technology, real-time feedback and car owners. Chengdu is the court, there are two network anti-theft devices. (1) Global Positioning System (GPS) GPS works: using the received signal and the satellite launching ground monitoring equipment and GPS signal receiver consisting of a global positioning system, a constellation of satellites continuously transmit the moving target --- three-dimensional position of the car, velocity and time information from the received feedback information to learn the location of defects in the car had GPS theft are: First, there is no established satellite positioning GPS ground control center of the region do not work; the second is due to the limited number of satellites, information scan covering certain "blind spots", so often in fact monitored intermittently "lost" state; Third, prices are generally a few thousand dollars or more, so that ordinary people prohibitive. (2) GQF Chengdu, a car anti-theft device Aviation Institute researchers a new highly reliable network anti-theft device recently developed. This anti-theft device works is: use the current coverage of very wide telecommunications network, to achieve real-time two-way interaction with the owners of cars, so as to achieve security barrier Pirates purposes. The device uses the thieves can not recover circuit design structure, the import of advanced sensors, and a multi-alarm signal, wherein the thieves hit at any point, the device will immediately lock the circuit, the high voltage circuit inside the car, while denying the generator circuit emergency work, also issued through a telecommunication network to mobile phone owners or pager alarm time voice and subtitles, and car theft did not perception, until the owner off setting up.

In time to find their own type of vehicle anti-theft locks, anti-theft lock manufacturers will choose, and in the choice of the manufacturer, when having a look at whether its stores operate, install anti-theft devices qualifications, whether a legitimate business license and public security organs qualification certificate. Second, look at its sales of anti-theft devices indicate whether the place of origin, which is installed after the availability of service and the basic fault warranty protection. Third, look at whether its store anti-theft device manufacturer holds power of attorney, which indicates whether the store brand of this alarm have a more comprehensive understanding, and to give manufacturers installation training and recognition. Four to see anti-theft device installed, install and see whether the official seal stamped with the telephone number and alarm warranty card.